Greek Capital Letter Omicron With Oxia
HTML Entity Browser Test:

U+1FF9 is the Unicode hex value of the character Greek Capital Letter Omicron With Oxia, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

In addition, U+1FF9 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+1FF9
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping 038C
Mirrored N
Lowercase Version U+1F79
Unicode Character Encodings
Greek Capital Letter Omicron With Oxia HTML Entity Ό (decimal entity), Ό (hex entity)
Windows Key Code Alt 8185 or Alt +1FF91
Programming Source Code Encodings Python hex: u"\u1FF9", Hex for C++ and Java: "\u1FF9"
UTF-8 Hexadecimal Encoding 0xE1BFB9
1 To type a Unicode symbol in Windows, hold down the ALT key and enter the decimal or hexadecimal code provided using the numeric keypad. The decimal alt code (Alt 8185) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +1FF9) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Greek Capital Letter Omicron With Oxia character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.